The Hubble Space Telescope (HST) was used to observe
C/2002~C1 (Ikeya-Zhang) for 9 orbits during 2002
April~20-23~UT when the comet's heliocentric distance was
0.9~AU and the geocentric distance was 0.4~AU. Spectral
images taken with the Space Telescope Imaging Spectrograph
(STIS) show cometary emissions from H, O, C, S, CO (4PG and
Cameron bands), C\rm 2 (Mulliken bands), CS, S\rm
2, OH, and NH at a spatial resolution better than
0.1~arcsec. The large gas production rate of this comet
(Q_{\rm H2O} \sim 2.3 \times 10^{29}), together
with the excellent spatial resolution and pointing accuracy
of the HST observations, permit a detailed investigation of
the spatial brightness profiles of all species in the inner
coma. In addition to allowing more accurate determinations
of gas production rates, the spatial profiles provide
information on the lifetime and source of S\rm 2, the
lifetime of the parent of CS, and constraints on the source
of CO. Preliminary abundance ratios derived from the STIS
spectra are H2O:CO:S_{\rm 2}:CS_{\rm 2} =
100:8:0.0037:0.1.

We gratefully acknowledge financial support from NASA
through grant number HST-GO-09496.01 from the STScI, which
is operated by AURA under NASA contract NAS5-26555.

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